Crown block



Patented May 15, 1928.

PATENT OFFICE.

GUSTAVE I. COBMIER, 0F SEMINOLE, OKLAHOMA.

CROWN BLOCK.

Application filed May 3, 1927. Serial No. 188,500.

This invention relates to crown blocks particularly applicable for deep well derricks, or similar structures where heavy loads are required to be lifted.

An object of my invention is to provlde a block which may readily be adjusted on its support to aline it with any other traveling block which may be in use, thus eliminating friction and side pull in the block.

Another object is to provide a block in which pulleys may be added or removed with a minimum of labor.

Still another object is to provide a crown block which is simple and effective in operation.

Other objects, advantages, and features of invention, may appear from the accompanying drawing, the subjoined detailed description, and the appended claims.

In the drawing:

Fig. 1 is a perspective view of my crown block.

Fig. 2 is a transverse sectional view of the same.

Referring more particularly to the drawmg:

To top members 1,1 of the derrick I secure a pair of parallel beams 2, 2 upon which beams my crown block 3 is mounted. A hollow shaft 4 rests on the beams 2, 2 8.11M is adjustably secured thereto by straps 5, 6 which straps pass over the shaft and hook around the bottom of the beams 2, 2, as shown at 7, 8, respectively. Turnbuckles 9, 10 are provided in the straps 5, 5, respectively, so that the shaft can be held securely in position on the beams. It will be apparent that by loosening the turnbuckles 9, 10 that the shaft 4 and straps 5, 6 can be shifted longitudinally of the beams 2, 2to adjust the block to any required position. Also, the shaft 4 can be shifted longitudinally so as to center the block.

A plurality of pulleys 11 are rotatably mounted on the shaft 4. and each pulley is mounted on an anti-friction bearing 12, which bearing surrounds the shaft 4:. The

bearings 12 are each lubricated through a pipe 13 which extends through the hollow shaft 4 to the bearing. The pulleys 11 are held in position on the shaft by side plates 14, 15, which plates bear against the outer pulleys and are screwed onto the shaft 4. The plates 14, 15 enable the pulleys 11 to be removed from the shaft, as desired, and also center the pulleys on said shaft.

To prevent tilting of the beams 2, 2, I provide brace blocks 16 between said beams and bolts 17 extend through the beams and block, thus holding said beams in a vertical position.

Having described my invention, I claim:

1. A crown block adapted to be mounted on a pairof beams, a. shaft, straps extending over said shaft, and hooked under the beams, turnbuckles on the straps, and pulleys rotatably mounted on the shaft.

2. A crown block adapted to be mounted on a pair of beams, a shaft, straps extending over said shaft, and hooked under the beams, turnbuckles on the straps, and pulleys rotatably mounted on the shaft, and

means adjustably and removably securing the pulleys on the shaft.

3. A crown block including a pair of beams, blocks secured between said beams, a shaft, straps extending over the shaft and hooked under the beams, turnbuckles in the straps, pulleys rotatably mounted on the shaft, and lates screwed onto the shaft against the sides of the pulleys.

4. A crown block including a pair of beams, blocks secured between said beams, a shaft, straps extending over the shaft and hooked under the beams, turnbuckles in the straps, pulleys rotatably mounted on the shaft, and plates screwed onto the shaft against the sides of the pulleys, anti-friction bearings upon which said pulleys are mounted, and lubricating pipes extending through the shaft to the bearings.

In testimony whereof, I aflix my signature.

GUSTAVE J. OORMIER. 

